程序结构：
MainActivity文件中代码：复制代码 代码如下:
package com.android.buttonpageflipper;
import android.app.Activity;
import android.graphics.PixelFormat;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.view.Gravity;
import android.view.MotionEvent;
import android.view.View;
import android.view.WindowManager;
import android.view.WindowManager.LayoutParams;
import android.widget.ImageView;
import android.widget.ViewFlipper;
public class MainActivity extends Activity {
//声明两个按钮，分别代表向左和向右滑动
private ImageView btnLeft=null;
private ImageView btnRight=null;
//设置WindowManager
private WindowManager wm=null;
private WindowManager.LayoutParams wmParams=null;
//ImageView的alpha值
private int mAlpha = 0;
private boolean isHide;
private ViewFlipper viewFlipper = null;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
setTitle("Android实现渐显按钮的左右滑动效果");
viewFlipper = (ViewFlipper) this.findViewById(R.id.myViewFlipper);
//初始化左右按钮
initImageButtonView();
}
private void initImageButtonView(){
//获取WindowManager
wm=(WindowManager)getApplicationContext().getSystemService("window");
//设置LayoutParams相关参数
wmParams = new WindowManager.LayoutParams();
//设置window type
wmParams.type=LayoutParams.TYPE_PHONE;
//设置图片格式，效果为背景透明
wmParams.format=PixelFormat.RGBA_8888;
//设置Window flag参数
wmParams.flags=LayoutParams.FLAG_NOT_TOUCH_MODAL
| LayoutParams.FLAG_NOT_FOCUSABLE;
//设置x、y初始值
wmParams.x=0;
wmParams.y=0;
//设置窗口长宽数据
wmParams.width=50;
wmParams.height=50;
//创建左右按钮
createLeftButtonView();
createRightButtonView();
}
private void createLeftButtonView(){
btnLeft=new ImageView(this);
btnLeft.setImageResource(R.drawable.left);
btnLeft.setAlpha(0);
btnLeft.setonClickListener(new View.onClickListener() {
public void onClick(View arg0) {
//上一个图像
viewFlipper.setInAnimation(MainActivity.this, R.anim.push_left_in);
viewFlipper.setOutAnimation(MainActivity.this, R.anim.push_left_out);
viewFlipper.showPrevious();
}
});
//调整窗口
wmParams.gravity=Gravity.LEFT|Gravity.CENTER_VERTICAL;
//显示图像
wm.addView(btnLeft, wmParams);
}
private void createRightButtonView(){
btnRight=new ImageView(this);
btnRight.setImageResource(R.drawable.right);
btnRight.setAlpha(0);
btnRight.setonClickListener(new View.onClickListener() {
public void onClick(View arg0) {
//下一个图像
viewFlipper.setInAnimation(MainActivity.this, R.anim.push_right_in);
viewFlipper.setOutAnimation(MainActivity.this, R.anim.push_right_out);
viewFlipper.showNext();
}
});
//调整窗口
wmParams.gravity=Gravity.RIGHT|Gravity.CENTER_VERTICAL;
//显示图像
wm.addView(btnRight, wmParams);
}
private Handler mHandler = new Handler()
{
public void handleMessage(Message msg) {
if(msg.what==1 && mAlpha<255){
//通过设置不透明度设置按钮的渐显效果
mAlpha += 50;
if(mAlpha>255)
mAlpha=255;
btnLeft.setAlpha(mAlpha);
btnLeft.invalidate();
btnRight.setAlpha(mAlpha);
btnRight.invalidate();
if(!isHide && mAlpha<255)
mHandler.sendEmptyMessageDelayed(1, 100);
}else if(msg.what==0 && mAlpha>0){
mAlpha -= 10;
if(mAlpha<0)
mAlpha=0;
btnLeft.setAlpha(mAlpha);
btnLeft.invalidate();
btnRight.setAlpha(mAlpha);
btnRight.invalidate();
if(isHide && mAlpha>0)
mHandler.sendEmptyMessageDelayed(0, 800);
}
}
};
private void showImageButtonView(){
isHide = false;
mHandler.sendEmptyMessage(1);
}
private void hideImageButtonView(){
new Thread(){
public void run() {
try {
Thread.sleep(1500);
isHide = true;
mHandler.sendEmptyMessage(0);
} catch (Exception e) {
}
}
}.start();
}
@Override
public boolean onTouchEvent(MotionEvent event) {
switch (event.getAction()) {
case MotionEvent.ACTION_MOVE:
case MotionEvent.ACTION_DOWN:
showImageButtonView();
break;
case MotionEvent.ACTION_UP:
hideImageButtonView();
break;
}
return true;
}
@Override
public void onDestroy(){
super.onDestroy();
//在程序退出(Activity销毁）时销毁窗口
wm.removeView(btnLeft);
wm.removeView(btnRight);
}
}
main.xml文件中代码：
复制代码 代码如下:
android:layout_width="fill_parent"
android:layout_height="fill_parent">
android:layout_height="fill_parent"
android:gravity="center">
android:layout_height="wrap_content"
android:src="@drawable/one"
android:gravity="center" />
android:layout_height="fill_parent"
android:gravity="center">
android:layout_height="wrap_content"
android:src="@drawable/two"
android:gravity="center" />
android:layout_height="fill_parent"
android:gravity="center">
android:layout_height="wrap_content"
android:src="@drawable/three"
android:gravity="center" />
android:layout_height="fill_parent"
android:gravity="center">
android:layout_height="wrap_content"
android:src="@drawable/four"
android:gravity="center" />
android:layout_height="fill_parent"
android:gravity="center">
android:layout_height="wrap_content"
android:src="@drawable/five"
android:gravity="center" />
push_left_in.xml文件中代码：
复制代码 代码如下:
android:duration="500" />
push_left_out.xml文件中代码：
复制代码 代码如下:
android:duration="500" />
push_right_in.xml文件中代码：
复制代码 代码如下:
android:duration="500" />
push_right_out.xml文件中代码：
复制代码 代码如下:
android:duration="500" />
最后，别忘记了在配置文件中设置权限。
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